What can you do against recurrent nightmares?

I often have nightmares, even after a normal, fun day. They regularly go on animals such as a tiger that wants to eat me or my cat could talk. There was a time I walked in the park until I was attacked by huge frogs. Sometimes when I wake up, everything the night was still in bed next to it.

In my nightmares always the same pattern: there’s always something with animals, but I do not know why, just because I love you very much animals. Do you advice?